Super high density laser two-dimensional scanning device based on modulation frequency measurement

Abstract

The invention relates to a super high density laser two-dimensional scanning device based on modulation frequency measurement. The device comprises a high frequency signal generator (1), a laser device (2), a reference distance board (3), an echo detector (4), a shaping module (5), a frequency discriminator (6), a scanning mirror (7), an angle coder (8), a coding counting circuit (9), a distance calculation module (10) and a two-dimensional data processing module (11). According to the device, super high frequency square wave modulation on laser is carried out, in a target scanning process, a vision distance from a target surface to a scanning device generates continuous change, the distance change rate can be reflected through the laser echo frequency, an internal distance reference point corresponding to an initial position of the scanning mirror is used for reference, and the vision distance from the target surface to the scanning device can be acquired through integration of the distance change rate; measurement repetition frequency is determined only by modulation frequency and the output rate of the frequency discriminator and is not limited by a fuzzy distance, and the measurement repetition frequency can be improved to GHz.

Description

technical field [0001] The invention relates to a laser two-dimensional imaging device, which can better overcome the ruler limitation of the phase measurement method and the fuzzy distance limitation of the pulse flight measurement, and increase the measurement repetition frequency to hundreds of MHz. Background technique [0002] In the field of laser radar and laser two-dimensional scanners, currently commonly used laser ranging methods mainly include phase measurement method and time-of-flight based pulse direct ranging method. [0003] Phase measurement is mainly to achieve distance measurement by comparing the phase difference between the target echo and the reference signal. In order to overcome the distance ambiguity, multiple measuring rulers are usually used for measurement, and the measurement repetition frequency is limited by the longest measuring ruler. Taking the measurement distance of 75m as an example, the modulation frequency corresponding to the longest m...

AI Technical Summary

Problems solved by technology

[0005] The technical solution of the present invention is to provide an ultra-high-density laser two-dimensional scanning device based on modulation frequency measurement, which can break through the phase measurement The measuring ruler limit of the method and the fuzzy distance limit of the pulse flight measurement increase the measurement repetition frequency at the current stage to several hundred MHz, thereby increasing the measurement efficiency by more than a hundred times

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